Degussa Aktiengesellschaft

Degussa - Huls Ag

Dmc2 Degussa Metals Catalysts Cerdec Ag

Omg Ag & Co Kg

Ralph Kiessling

Martin Foerster

Josef Piroth

Rainer Domesle

Ulrich G&ouml;bel

Andreas Gutsch

Michael Harris

Dieter Detterbeck

Lutz Marc Ruwisch

Oliver St&ouml;hr

The invention provides a process for coating a cylindrical carrier structure with a predetermined amount (target take-up) of a coating suspension, wherein the carrier structure has a cylinder axis, two end faces, an encasing face and an axial length L and a large number of channels running from the first end face to the second end face. The process comprises: a) vertically aligning the cylinder axis of the carrier structure and filling the empty volume of the channels up to a predetermined height H starting from the lower end face, b) removing the excess coating suspension through the lower end face of the carrier structure down to the target take-up, c) turning the carrier structure 180&deg;, so that the upper and lower end faces are exchanged one for the other, and d) repeating steps a) and b), wherein the height H , up to which the channels are filled in this case is given by H &equals;L&minus;x&middot;H where x is between 0.8 and 1.0.

Process for coating a carrier structure

A method for producing a nitrogen oxide storage material that contains at least one storage component in the form of particles of an oxide, carbonate or hydroxide of the elements magnesium, strontium, barium, lanthanum and cerium on a carrier material from the group consisting of doped cerium oxide, cerium/zirconium mixed oxide and aluminum oxide or mixtures of these. The method is carried out by suspending the support material in an aqueous solution of precursors of the storage components, this suspension is then introduced into a hot gas stream, the temperature of which is calculated so that, during a residence time of the suspension in the hot gas stream of less than one minute, the solvent of the suspension is evaporated out and the precursors of the storage components are thermally broken down and converted to the storage components before the storage material that forms in this way is separated from the stream of hot gases.

Method for producing a nitrogen oxide storage material and a storage material made with it

A method for partially coating a cylindrical carrier body with a coating suspension, the carrier body having a cylindrical axis, two end faces, an envelope, and an axial length L, and being provided with a series of channels extending from the first end face to the second end face. A desired coating quantity of the coating suspension is applied onto the carrier body by vertically aligning the cylindrical axis and introducing the coating suspension into the channels through the lower end face. The carrier body, measured from the lower end face, is filled with a filling volume of the coating suspension which is metered, such that the carrier body is only filled up to a height that amounts to a predetermined fraction of its length L. Subsequently, excess coating suspension is removed downward so that the desired coating quantity remains on the carrier body.

Method for partially coating a carrier body

A suspension, dispersion or emulsion is introduced into a burner. A two-stage after-treatment is then carried out. The resulting powder can be employed as a catalyst.

Process for the preparation of pulverulent heterogeneous substances

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Limeshain, Germany

Ralph Kiessling